Fluid operated rotary motor and lubricating means therefor



Patented July 22, 1952 UNITED sTAjT 'poemi-fj# Elwin OBERATEDRorlmrMo'rhoi'rANDv l -LUBnIoA'rING MEANS ,THEREFQR f Yraul H. Nast; West springeiigiiiia Worthington `Puni') and 'MachineryCorpora-l l Vi011 HarriS0D,.N.*J.',.a corporationoi Delaware ssiguoi" t .appliquent/ray 1;f1947,"seriailNoL7473131 f This invention relates toV pumps and more particularly to pressure fluid operated centrifugal Pumps'- A.An object of the present invention is to provide means for lubricating the working parts ofjjaz centriiugalpump which is` operated byan air' motor land'wherein the pressureoff the operating pressure'air or otherjfluid is Autilized for disfgr tributing lubricant to the Working parts 'ofjthej 10 mechanism;

v Vi/'iththese and other objects in View, -as may appear from' the'accornpanying specification,- the invention-consists vof various features rv'of construction Land combination'- of parts,v which will bev lrstdescribed in connection with thea'c'oinpanying'- drawings, showing a fluid operated rotarymoton and lubricating means therefor" of a vpr'ei'erred form embodying the invention.;and:y

thefeatures formingrv the invention will bespef c i'ically pointed Aout the cla'iins. "-Inthe drawings:

--Figure '1 is a vertical section through the vimprovedpressure iiuidv operated pump f Figure 2 is an enlarged section through a part of lthe lubricant distributingv lstructure l oi the p-umbl. f. n l

The present invention relates primarily to the lubricating means or lubricatingpressure `iuid" operated pumps such as shown, described and claimed in my companion application, Serial No.V 744O55,iiled' April 26, 1947, now abandoned. 'Referring more particularly to the drawings,

the pressure operated centrifugal pump with which the improved lubricating system isl employed includes a motor housing vI to Which-is attached in any suitable manner, through the medium of an intermediate casing section I', the pump casing 2. The motor housing I hasa rotor 3`th'erein which comprises a hubv 4. The -hubj carries the vanes I S of they motor whichj vanes eiprocatejrelative tov the hub 4 as shown and described inn the above iden'tied companion applicatiomiand 'cooperate with the motor liner impel1er 2"of the centrifugalpui/np 25 The rotor 3 is operated by air 'under pressure taken fr om'any suitablesource (not shown) and itl enters the pumping `unit 'through a hand.

operated throttleA valve 1'. From the throttle valve 'I the air pressure passes through a screen 8 into the valve cylinder 9. The 'valvecylinder therein Whichby its reciprocating Vmovementcontrols the radial -ports II through'which the airr 7 oiaims.. 01. raie-67) pressure `passes 4froinjthe valve cylinder Q into`v the annular j passage I2.

the motori inlet cor'ir'iection I3 and duct I'linto tributedinto the housing I for; imp ingement against the blades 6of the distributing .inlet Apassages I5. The construction of the airmotor proper, that is, the rotor anditsA stat or'or' hous ing in which it rotates is of approved construc tionwellknown in the art. 1

The hub 4' of the rotor 3 has an axially ex-A tending vshaft extension I6 4'thereon which rotates in ai suitable bearing I1 carriedv/ithin the housing The .shaft I6 is provided with a longitudinally extendinglaxial.bore I8 in which is threaded a sleevellfi 'I he sleeveil hasa anged head v2U on'its outer endto Which 'are pivotally connected a pluralityof fly Weights 2|. The fly Weights Zlihave shoulders 22 formed thereon Whichen`7` gage] beneath a collar 23 formed on a pin 24. The'p in 24" is"'slid ably carriedby thesleeve I9y and its upper endV engages agains'tthe Ylower end of an operating pin 25. The operating pin 25 is slidably carriedl by the inner end of the valve` cylinder Q and eXtends -into thevalve cylinder for engagement with the plungerv Valve |0 The plungervalveID vis provided'with a plurality of l openings 26 extending therethrough which perf;

mits theairvun'der pressure to paSs'throughth'e plunger valve and equalize the pressure against each" endof the plunger valve. A spring 2l is, mountedin thejcylinder and engages the plunger valve I0 :and is vtensioned 'to'move the plunger against the tension of the spring 2] and gradually', I

out o ff'the radial ports-f LLffIfhat is, the plunger valve AI 0 will 'move in vproportion toy theA speed' of rotation )of tlie` rotor 3 to gradually j reduce the size of the ports" II and consequently reduce the quantity flow of pressure fluid to the motor'i3 for; reducing the lspeed of rotation of the motor. The airexhaust fromtne motor through the. out; let 'l Passages.. 29, anifold. ,passage in; ndfdischarge pasfsage 3|. g; v s Y fIhe hub 4,101 the rotor 3 .has asecond'shaft extension 32 formed'axially thereon andextend- From the annularpassage I 2 theair underpressure passes through ing into opposite direction from the shaft extension I6. The shaft extension 32 is rotatably supported by a suitable ball bearing structure 33 which is held in position by means of a nut 34 threaded on the shaft 32 and a lock washer 35.

The shaft 32 has a pump impeller 36 mounted thereon inthe usualmanner sothat-the pumps, impeller 36' is." direct' connected `through theme-- dium of the shaft 32 with the rotor 3 of the air motor 3. A suitable packing structure 31 of any-y approved form is provided about the shaft 32 between the pump impeller 36l and the fmotor3- to prevent leakage of fluid piumped'l into i the motor, the shaft bearings andlabouttheshaf't This packing may be of any approved construcja;

tion. The impeller 36 is of.any,"approvedttypef of centrifugal impeller having,v a plurality of l vanes 38 which form the normal pumpingwanes and auxiliary pumpout vanes 39 on itsf back which are provided to prevent water or fluid pumped, from.. .passing through the clearance spaces. indicated, at 40.'.back into tlie. motor; structure.. Thecasing ll. of thepump has an inletstructure.42 attached thereto by. suitable boltsp43 and`L this'inlet structure comprisessuitable metaldiscs. Mbetweenwhich are supported a screeningcage 'to prevent foreign .material of`such size as to. impede or interfere with the operationof 1 the pump. from entering the pump. Assliown in the drawings, the .centrifugal pump isof jthe, usual; axialinlet or suction typetlie inletvbeingindicated. at.,46, while. the discharge indicated atll isperi'pheral."

intermediate casing section 1"" is.V hollow. to vprovideareservoir.. 5U! which islld with a suitable lubricant vthrough .a filler .connection ,5l Asjshown .in .Figure 1 of"thedrawings,v the supply. duct" [.41A which'. delivers the. operating, pressure. fluid to. the' motor structure. 3. is conr'lected'A to. the reservoir. by a. passage 5.2. which is` pro.- videdwith a'restriction153.. The passage.52 'pen mits Yair under pressure to ,flowintothereservoir 50. andexert -a pressure upon .thelu'bricantcontainedfinthereservoir so as-toiorce thelubricant upwardly through the. restricted passagewayfd. rIhe passageway. 54 is formed in thereservoir` 50` bythe partition 557 andits upper-.discharge end opens into the space or recess. 56=formed-in the plug! 5T.. The plug. Elis'removably carri'edlby. the; motori. base plate 58 andi. it .is provided .withka relatively. small vpassageway. 59 whichcommunicateszwiththe recess-56 and .permits-.the lubricant. to pass. from the.restrictedpassageA through. the small passage SS-intoandthroughthe pad.- ding B0. ofv felt or othermaterialwhich. actsv to` restrict the flow of the lubricant. A secondlpassagel opens communication .between the felt-or other restricting pad 60 andthe. interior. of the. motor structure 3 so :that-when pressure. operating iluidowsfto. the motorv under/icontrol? of .ther reciprocatingplunger valveu I0, asmallquantity. ofsuch. pressure. fluidv will, in.- paslsing. into, the. lubricantv reservoir. 50.. exert a pressure on. the. lubricant. thereinl .and force it through the. re.- strictingmeans comprising theplugl, passage, B9', pad 60 andsmall` passage 6l into themotor. structure for lubricating the moving parts of the. motor.

'Ilhe opening, onpassage way E] into. the. ex.- haust end-of the motor. islocated so .that during: rotation of the rotor 3 the blades or vanesli. passover the opening of this passage.` This. condition results .in a fluctuation of backpressure, .opposing the pressure of. theincoming-,oih The resultant 4 rapid drop in pressure acts yas a check in not permitting a steady free flow of oil into the motor.

It will be understood that the invention is not to vbe limited to the specific construction or arrangement of parts shown, but that they may be widely modified within the invention dened by the claims..- Y Y Y What'is claimed'is:

1. In a pressure fluid operated motor having a rotor with sliding vanes the combination of, a housing including alubricant reservoir therein, a supply;` duct in said housing for conducting operating fluid to said vanes, an extended portion of said supply duct. for' delivering operating fluid directly to saidlubricant reservoir to allow positivepressu'reto actv therein, a passageway independently communicating between said lubricant reservoir and said` motor, outlet means restricting the flow of lubricant through said passageway, said vanes during rotation in operative relationto said outlet meansto openand close;said outletmeans to. intermittently check thellowfof.w lubricant therethrough responsive to the fiuctuatlingfzpressure. created, and means-for. controlling deli-veryof pressure fluid tosaid .motor andsaid., lubricant reservoir. e f y 2; In a pressure .fluid operated motorfhavingla.- rotor withsliding vanes the combinationvof, a.. housing including a lubricant reservoir therein,.` a supply duct in said housing for conductingoperating fluidto said motor, an extendedgportion of said supply duct for delivering operating fluid directly tosaid lubricant reservoir to allow posi-f tivepressure to. act therein, said extended .por-- g tion ofthe supply.4 duct havingl a restrictedpas:r

sageway vopening into the lubricant reservoin. a. second passageway independently communicating.. between said lubricant reservoir andfsaidmotorf. outletA meansv restricting.- the flow ofl lubricant.. through said second passageway, said outlet'. means opening into the discharge side of said motor and being so constructed and arranged that rotationof said .vanes will open and-close.- said outlet-meanstointermittently check the flow of lubricant therethrough responsive-to the fluo-- tuating pressure created, and means forl con-.- trolling-delivery of pressurel fluid to saidrm'otor and lubricant reservoir.

v3. Ina vpressure fluid .operated motor havinga rotor with sliding vanes the combinationofpa. housing including a lubricant reservoirV therein; ausupply duct in said housing for conductingoperating fluid to said motor, an extended portion. of said-supply duct` for deliveringoperating iluid. directly to said lubricant reservoir to allow posi-A tive pressure to act therein, said extended-por.- tion of the'supply duct havingv a restricted pas.- sageway opening into the lubricant reservoir, a. second passageway independently communicating;- betweensaidlubricant reservoir. and said moton. a restricted outlet for'said second passageway ad. jacentthe discharge end of. said motor,.a.re movable `plug inv said second .passagewayl havinga relatively small boretherein. to provide..continu-n ous communicationbetween saidsecond passage:- way and saidrestricted outlet, a felt padding mounted in saidpassageway to beheld in position between said. restricted outlet and saidlplug, bythreadedl engagement of saidplug with said' passageway, saidrestricted outlet being so confstructed andarranged with vrespect ,to said vanes as tobe opened andclosed during rotation thereof to intermittently check the flow' of. lubricant'. therethrough responsive vto the iiuctuating Prefssure created,.andmeansfor controlling delivery:

of pressure fluid to said motor and said lubricant reservoir.

4. In a pressure fluid operated motor having a rotor with sliding vanes the combination of, a housing including a lubricant reservoir therein, a supply duct in said housing for conducting operating fluid to said motor, an extended portion of said supply duct for delivering operating fluid directly to said lubricant reservoir to allow positive pressure to act on said lubricant, said eX- tended portion of the supply duct having a restricted passageway opening into the lubricant reservoir, a second passageway independently communicating between said lubricant reservoir and said motor to allow said lubricant to be forced out of said lubricant reservoir by the pressure fluid therein, a removable plug having a relatively small bore therethrough in said second passageway, a felt padding across said plug to restrict the flow of lubricant through said plug, an outlet passageway in said plug to allow lubricant to pass through said felt to said motor, said outlet passageway adapted to open into the dis,- charge of said motor and to be opened and closed by said vanes during rotation to intermittently check the flow of lubricant therethrough, and a valve means for controlling delivery of pressure iluid to said motor and to said reservoir.

5. In a pressure fluid operated motor having a rotor with Asliding vanes the combination of, a

housing including a lubricant reservoir therein,V

a supply duct in said housing for conducting operating uid to said vanes, said lubricant reservoir adapted yto receive fluid under pressure therein to allow positive pressure to act on said lubricant, a passageway independently communieating between said lubricant reservoir and said motor, outlet means restricting the flow of lubricant through said passageway, said vanes during rotation in operative relation to said outlet means to open and close said outlet means to uitermittently check the ow of lubricant therethrough responsive to the fluctuating pressure created, and means for controlling delivery of pressure fluid to said motor.

6. In a pressure uid operated motor having a rotor with sliding vanes the combination of, a c

housing including a lubricant reservoir therein, a supply duct in said housing for conducting operating fluid vto said vanes, said lubricant reservoir adapted to receive fluid under pressure therein to allow positive pressure to act therein, a passageway independently communicating between said lubricant reservoir and said motor,

said passageway having a relatively small crosssectional area in comparison with the crosssectional area of said lubricant reservoir, outlet means restricting the flow of lubricant through said passageway, said vanes during rotation in operative relation to said outlet means to open and close said outlet means to intermittently check the now of lubricant therethrough responsive to the fluctuating pressure created, and means for controlling delivery of pressure fluid to the motor.

"7. In the combination with a pressure fluid operated motor as claimed in claim 3 wherein the second passageway is of relatively small crosssectional area in comparison with the crosssectional area of said lubricant reservoir whereby back pressure acting in said second passageway will be able to momentarily check the flow of lubricant through said passageway and restricted opening.

PAUL H. NAST.

' REFERENCES CITEDY The following references are of record in the file of this patent:

UNITED STATES PATENTS Blom I July 15, 1947 

